Revenues from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Feb. 28, 2021	Feb. 29, 2020
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	$ 1,247,513	$ 775,941
Investment Banking and Capital Markets
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	1,240,600	771,537
Asset Management
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	6,913	4,404
Americas
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	1,033,500	650,049
Americas | Investment Banking and Capital Markets
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	1,026,916	649,069
Americas | Asset Management
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	6,584	980
Europe
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	164,066	82,862
Europe | Investment Banking and Capital Markets
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	163,737	79,438
Europe | Asset Management
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	329	3,424
Asia Pacific
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	49,947	43,030
Asia Pacific | Investment Banking and Capital Markets
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	49,947	43,030
Asia Pacific | Asset Management
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	0	0
Investment banking - Advisory
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	311,439	343,158
Investment banking - Advisory | Investment Banking and Capital Markets
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	311,439	343,158
Investment banking - Advisory | Asset Management
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	0	0
Investment banking - Underwriting
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	692,223	248,844
Investment banking - Underwriting | Investment Banking and Capital Markets
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	692,223	248,844
Investment banking - Underwriting | Asset Management
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	0	0
Equities
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	233,539	176,249
Equities | Investment Banking and Capital Markets
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	233,539	176,249
Equities | Asset Management
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	0	0
Fixed income
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	3,399	3,286
Fixed income | Investment Banking and Capital Markets
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	3,399	3,286
Fixed income | Asset Management
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	0	0
Asset management
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	6,913	4,404
Asset management | Investment Banking and Capital Markets
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	0	0
Asset management | Asset Management
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	$ 6,913	$ 4,404